<?php

if (! defined ( 'BASEPATH' ))
	exit ( 'No direct script access allowed' );
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 2.0
 * @filesource
 */

// ------------------------------------------------------------------------


/**
 * Utf8 Class
 *
 * Provides support for UTF-8 environments
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	UTF-8
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/utf8.html
 */
class CI_Utf8 {
	
	/**
	 * Constructor
	 *
	 * Determines if UTF-8 support is to be enabled
	 *
	 */
	function __construct() {
		log_message ( 'debug', "Utf8 Class Initialized" );
		
		global $CFG;
		
		if (preg_match ( '/./u', 'é' ) === 1 and // PCRE must support UTF-8
function_exists ( 'iconv' ) and // iconv must be installed
ini_get ( 'mbstring.func_overload' ) != 1 and // Multibyte string function overloading cannot be enabled
$CFG->item ( 'charset' ) == 'UTF-8') // Application charset must be UTF-8
{
			log_message ( 'debug', "UTF-8 Support Enabled" );
			
			define ( 'UTF8_ENABLED', TRUE );
			
			// set internal encoding for multibyte string functions if necessary
			// and set a flag so we don't have to repeatedly use extension_loaded()
			// or function_exists()
			if (extension_loaded ( 'mbstring' )) {
				define ( 'MB_ENABLED', TRUE );
				mb_internal_encoding ( 'UTF-8' );
			} else {
				define ( 'MB_ENABLED', FALSE );
			}
		} else {
			log_message ( 'debug', "UTF-8 Support Disabled" );
			define ( 'UTF8_ENABLED', FALSE );
		}
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Clean UTF-8 strings
	 *
	 * Ensures strings are UTF-8
	 *
	 * @access	public
	 * @param	string
	 * @return	string
	 */
	function clean_string($str) {
		if ($this->_is_ascii ( $str ) === FALSE) {
			$str = @iconv ( 'UTF-8', 'UTF-8//IGNORE', $str );
		}
		
		return $str;
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Remove ASCII control characters
	 *
	 * Removes all ASCII control characters except horizontal tabs,
	 * line feeds, and carriage returns, as all others can cause
	 * problems in XML
	 *
	 * @access	public
	 * @param	string
	 * @return	string
	 */
	function safe_ascii_for_xml($str) {
		return remove_invisible_characters ( $str, FALSE );
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Convert to UTF-8
	 *
	 * Attempts to convert a string to UTF-8
	 *
	 * @access	public
	 * @param	string
	 * @param	string	- input encoding
	 * @return	string
	 */
	function convert_to_utf8($str, $encoding) {
		if (function_exists ( 'iconv' )) {
			$str = @iconv ( $encoding, 'UTF-8', $str );
		} elseif (function_exists ( 'mb_convert_encoding' )) {
			$str = @mb_convert_encoding ( $str, 'UTF-8', $encoding );
		} else {
			return FALSE;
		}
		
		return $str;
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Is ASCII?
	 *
	 * Tests if a string is standard 7-bit ASCII or not
	 *
	 * @access	public
	 * @param	string
	 * @return	bool
	 */
	function _is_ascii($str) {
		return (preg_match ( '/[^\x00-\x7F]/S', $str ) == 0);
	}

	// --------------------------------------------------------------------


}
// End Utf8 Class

/* End of file Utf8.php */
/* Location: ./system/core/Utf8.php */